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          每天进步一点点035 - assembleDebug太慢的问题调查
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            <div class="post-description">flutter遇到assembleDebug太慢的问题以及其他一些问题的调查</div>

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        <h1 id="Preface"><a href="#Preface" class="headerlink" title="Preface"></a>Preface</h1><p>最近在做flutter上的音频和视频方面的探索。<br>需要用到一些视屏区域截取，视屏导出成序列图等等。<br>这是昨天晚上到今天早上解决的一些问题的汇总，可能先后顺序之类的会记错；<br>此文目的用于提供一些解决问题的思路，聊以备忘，以使不忘，后事之师。</p>
<h1 id="Contents"><a href="#Contents" class="headerlink" title="Contents"></a>Contents</h1><h2 id="设备问题"><a href="#设备问题" class="headerlink" title="设备问题"></a>设备问题</h2><p>个人设备过老或者缺失</p>
<h3 id="mac-pro-early-2015"><a href="#mac-pro-early-2015" class="headerlink" title="mac pro early 2015"></a><em>mac pro early 2015</em></h3><p>xcode不能更新，所以最新的flutter项目没法用 <em>macos</em> 来debug，且硬件所限，运行 <em>idea</em> 都发出拖拉机的声音，所以 <em>android emulator</em>也是卡成狗  </p>
<h3 id="2013年的组装电脑"><a href="#2013年的组装电脑" class="headerlink" title="2013年的组装电脑"></a>2013年的组装电脑</h3><p>windows电脑都这逼样，超过一定年限，哪怕资源管理器里面内存和cpu占用不高，按下 <em>win+e</em> 都能反应半天，最后还是选了在windows上通过<em>android studio<em>加</em>x86 emulator</em> 来排除一些环境问题</p>
<h3 id="唯一的安卓设备-mi-pad"><a href="#唯一的安卓设备-mi-pad" class="headerlink" title="唯一的安卓设备 mi pad"></a>唯一的安卓设备 <em>mi pad</em></h3><p>由于意气之下弄坏了</p>
<h2 id="环境问题"><a href="#环境问题" class="headerlink" title="环境问题"></a>环境问题</h2><p>使用的部分flutter包只支持 <em>iOS</em>, <em>android</em>, <em>macOS</em>。  </p>
<h2 id="Running-Gradle-task-‘assembleDebug’"><a href="#Running-Gradle-task-‘assembleDebug’" class="headerlink" title="Running Gradle task ‘assembleDebug’"></a>Running Gradle task ‘assembleDebug’</h2><h3 id="使用国内源加速maven与gradle"><a href="#使用国内源加速maven与gradle" class="headerlink" title="使用国内源加速maven与gradle"></a>使用国内源加速maven与gradle</h3><p>老是卡这里，开始以为是 <em>maven</em> 没有使用国内源加速的原因，<br>先后在以下文件中替换了 <em>gradle</em> 的国内源 </p>
<ul>
<li>{flutter_home}/package/flutter_tools/gradle/flutter.gradle</li>
<li>/app/build.gradle<br>然而没什么鸟用。</li>
</ul>
<h3 id="直接使用命令行来进行gradle编译"><a href="#直接使用命令行来进行gradle编译" class="headerlink" title="直接使用命令行来进行gradle编译"></a>直接使用命令行来进行gradle编译</h3><p>然后根据网上提示，进入到 <em>android</em> 目录下，先后运行:</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">flutter clean</span><br><span class="line">./gradlew clean build</span><br></pre></td></tr></table></figure>
<p>这个时候就可以看到 <em>gradle</em> 真正的报错信息了.</p>
<blockquote>
<blockquote>
<blockquote>
<p>FAILURE: Build failed with an exception.</p>
</blockquote>
</blockquote>
</blockquote>
<p>Where:<br>Build file ‘F:\workspace\app\android\app\build.gradle’ line: 24</p>
<p>What went wrong:<br>A problem occurred evaluating project ‘:app’.</p>
<p>Failed to apply plugin ‘com.android.internal.application’.<br>Android Gradle plugin requires Java 11 to run. You are currently using Java 1.8.<br>Your current JDK is located in F:\Program Files\Java\jdk1.8.0_60\jre<br>You can try some of the following options:</p>
<ul>
<li>changing the IDE settings.</li>
<li>changing the JAVA_HOME environment variable.</li>
<li>changing org.gradle.java.home in gradle.properties.</li>
</ul>
<h3 id="java版本问题"><a href="#java版本问题" class="headerlink" title="java版本问题"></a>java版本问题</h3><p>好嘛，java版本问题，去oracle下载一个不就得了，于是下了个java 20。<br>多年未更新过java的我，渠道oracle下载java，居然要登陆！！！！！<br>更新完成，继续运行：</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">.\gradlew --status</span><br></pre></td></tr></table></figure>
<p>1个idle的,6个 stopped，没有问题,继续：</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">./gradlew clean build</span><br></pre></td></tr></table></figure>
<p>发现java 20也不行！友邦惊诧！！！<br>好嘛，写在java 20，我就给你装个java 11。<br>安装完java 11，尼玛，明明系统环境变量 <strong>$JAVA_HOME$</strong> 设置的就是新安装的 java 11的jdk根目录，缺还是去之前安装的java 20的目录下去找了！！！<br>为也是服了，在 <em>gradlew.bat</em> 中也打了日志，就是莫名其妙的在java 11的jdk目录下的bin中找不到java 执行文件！！！<br>网上说，java 20卸载不干净会有残留文件无法删除，导致此问题。<br>确认了一下，确实在之前的java 20目录下有残留文件，立即 <strong>shift + DEL</strong>， 妈蛋，文件使用中。<br>折腾之下还是重启电脑之后删除掉了。<br>此事运行运行 <em>clean</em>， 会有什么有趣的事情发生呢？</p>
<h3 id="javaHome-invalid问题"><a href="#javaHome-invalid问题" class="headerlink" title="javaHome invalid问题"></a>javaHome invalid问题</h3><blockquote>
<p>The supplied javaHome seems to be invalid.<br>于是，修改了 <em>gradle.property</em>:</p>
</blockquote>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">org.gradle.java.home&#x3D;f:\\Programe Files\\Java\\jdk-11</span><br></pre></td></tr></table></figure>

<p>此时，项目的源码可以编译通过，但是</p>
<h3 id="Unsuppoted-class-file-major-version-64"><a href="#Unsuppoted-class-file-major-version-64" class="headerlink" title="Unsuppoted class file major version 64"></a>Unsuppoted class file major version 64</h3><ul>
<li>首先，在build.gradle中，将最小版本调整为插件需要的最小版本</li>
<li>其次，此插件只能运行与移动平台与mac上，可以使用模拟器debug一下</li>
</ul>
<p>事实证明，模拟器中可以运行起来，无报错。</p>
<p>至此，以及可以完美的运行起来了，可以往项目中加屎了。</p>
<h2 id="资源服务器的问题"><a href="#资源服务器的问题" class="headerlink" title="资源服务器的问题"></a>资源服务器的问题</h2><p>app需要用到一些资源，于是打算在wsl装的ubuntu上搞一个http服务器专门用来提供资源管理。<br>用golang/gin写了一个简单的http静态资源服务器，打包linux:</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">set GOOS&#x3D;linux</span><br><span class="line">set GOARCH&#x3D;amd64</span><br><span class="line">go build</span><br></pre></td></tr></table></figure>
<p>好了，在 ubuntu 上执行 <code>explore.exe .</code> 之后，将刚才生成的可执行文件拉进来， 直接运行，完美；<br>使用 <code>nohup</code> 运行，卡在了命令行，于是，想起来我这台2013年的拖拉机确实无法承受如此重任，于是想到了上周从垃圾堆里翻出来的树莓派 3 B+;<br>重新将执行文件上传到树莓派:</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">scp /Users/duke/Downloads/reserver pi@192.168.3.25:/home/pi/res</span><br></pre></td></tr></table></figure>
<p>然后</p>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">chmod 777 ./reserver</span><br></pre></td></tr></table></figure>
<p>然后运行</p>
<blockquote>
<p>cannot execute binary file: Exec format error<br>难道是我的树莓派是32bit的？不应该啊，之前确认过是64bit的。<br>然后调查了一下，突然想起树莓派是arm架构的，于是</p>
</blockquote>
<figure class="highlight sh"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">set</span> GOOS=linux</span><br><span class="line"><span class="built_in">set</span> GOARCH=arm64</span><br><span class="line"><span class="built_in">set</span> CGO_ENABLED=0</span><br><span class="line">go build -o reserver.out ./release/raspberry/reserver.out </span><br></pre></td></tr></table></figure>
<p>然后，将此文件上传至树莓派，完美运行.</p>
<h1 id="Conclusion"><a href="#Conclusion" class="headerlink" title="Conclusion"></a>Conclusion</h1><ul>
<li>目前 flutter 只支持 java 11，官网下载java要登陆，国内其实有免登陆的下载源；  </li>
<li>无法忍受android项目 assembleDebug 太慢，可以自己手动调试一下；</li>
<li>gradle最后debug插件遇到问题很有可能其实是本地平台的问题，</li>
</ul>

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              <a href="/tags/linux/" rel="tag"># linux</a>
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